Estimation of water environmental capacity and pollution load reduction for urban lakeside of Lake Taihu, eastern China
Estimation of water environmental capacity and pollution load reduction for urban lakeside of Lake Taihu, eastern China
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DOI：
10.1016/j.ecoleng.2019.105587
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发表时间：
2019-11
影响因子：
3.8
通讯作者：
Renhua Yan;Yongnian Gao;Lingling Li;Junfeng Gao
中科院分区：
文献类型：
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作者：
Renhua Yan;Yongnian Gao;Lingling Li;Junfeng Gao
中国城市湖滨水网密集，社会经济活动日益加剧，地表水污染严重。水环境容量估算和污染负荷减少是恢复湖滨水生态系统的重要支撑。本文采用可行的环境模型和模型参数辨识方法，对典型城市湖滨即太湖的水环境容量和污染负荷减量进行了计算。结果表明：在降低20%目标下，区域年TN、TP、CODMn、BOD5和NH3-N的环境容量分别为99.25、7.77、37.36、144.63和95.85 t；在III类目标下，区域年环境容量分别为- 37.31、9.28、185.81、27.14和148.80 t。TN、TP、CODMn、BOD5和NH3-N污染负荷要分别减少60%、56%、77%、62%和51%才能达到降低20%的水质目标；要达到III类污染负荷，TN、TP、CODMn、BOD5和NH3-N污染负荷分别减少115%、47%、- 16%、93%和24%。其中，梁溪河、马里港河和鲁村河在两个目标下环境容量和污染负荷减量均较大，占区域总量的一半以上。雨季总氮、总磷、总BOD5和总cod环境容量和污染负荷减少量显著高于其他季节。
Chinese urban lakeside with dense water networks are experiencing the increasingly intensified social–economic activities and serious surface water pollution. The estimation of water environmental capacity and pollution load reduction are crucial supports for restoring lakeshore aquatic ecosystems. In this study, a feasible environmental model and some model parameter identification methods were used to calculate the water environmental capacity and pollution load reduction for a typical urban lakeside, namely, Lake Taihu. The results indicated that the regional annual environmental capacities for TN, TP, CODMn, BOD5, and NH3-N were 99.25, 7.77, 37.36, 144.63, and 95.85 t under reduced 20% objective, respectively and −37.31, 9.28, 185.81, 27.14, and 148.80 t under Class III objective, correspondingly. The TN, TP, CODMn, BOD5, and NH3-N pollution loads are required to be reduced by 60%, 56%, 77%, 62%, and 51% for satisfying the reduced 20% water quality objective, respectively, and 115%, 47%, −16%, 93%, and 24% for achieving Class III objective, respectively. Among the rivers, the Liangxi, Maligang, and Lucun Rivers had large environmental capacities and pollution load reductions under both objectives, constituting more than half of the total regional values. The TN, TP, BOD5, and CODMnenvironmental capacity and pollution load reduction were significantly higher during the rainy period than during the other periods.